Added Freezer to be able to freeze objects from common code (non-Native implementations just do nothing)

common/src/commonMain/kotlin/net/dankito/utils/multiplatform/Freezer.kt

@@ -0,0 +1,14 @@
+package net.dankito.utils.multiplatform
+
+
+expect class Freezer() {
+
+    companion object {
+
+        fun <T> freeze(obj: T): T
+
+        fun isFrozen(obj: Any): Boolean
+
+    }
+
+}

common/src/iosMain/kotlin/net/dankito/utils/multiplatform/Freezer.kt

@@ -0,0 +1,21 @@
+package net.dankito.utils.multiplatform
+
+import kotlin.native.concurrent.freeze
+import kotlin.native.concurrent.isFrozen
+
+
+actual class Freezer {
+
+    actual companion object {
+
+        actual fun <T> freeze(obj: T): T {
+            return obj.freeze()
+        }
+
+        actual fun isFrozen(obj: Any): Boolean {
+            return obj.isFrozen
+        }
+
+    }
+
+}

common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/Freezer.kt

@@ -0,0 +1,18 @@
+package net.dankito.utils.multiplatform
+
+
+actual class Freezer {
+
+    actual companion object {
+
+        actual fun <T> freeze(obj: T): T {
+            return obj // no op
+        }
+
+        actual fun isFrozen(obj: Any): Boolean {
+            return false // freezing is only possible on Kotlin/Native
+        }
+
+    }
+
+}